JPS6363404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an engine support device for a truck, bus or similar utility vehicle, which is fixable to a vehicle frame and an engine, respectively, and which are connected to each other via an elastomer spring. It relates to a type having a lower part and an upper part and a hydraulic damping device.

Engine support devices for resiliently supporting a truck engine are known. In this known engine support device, the part that is fixed to the vehicle frame is shaped like a bowl or U-shaped depending on the installation space, whereas the part that is fixed to the engine is shaped like a cone or a wedge. It has the shape of Between these two fixed parts at least two circulating ring-shaped shear springs or at least two block-shaped shear springs made of rubber are vulcanized. In such an engine support device,
Both high-frequency vibrations with small amplitudes, which occur during normal engine rotation, and low-frequency vibrations, with large amplitudes, such as those caused by engine starting, low-acceleration engine speed, or vertical movement caused by the roadway, are supported. Transmitted undamped from the top of the device to the shear spring, this undamped low frequency vibration results in an undesirably large stroke.

In order to dampen vibrations, it is known to additionally arrange hydraulic damping devices between the engine and the vehicle frame. However, this damping device does not allow undesired noise transmission, since although low-frequency vibrations with large amplitudes are indeed damped in the desired manner, high-frequency vibrations with small amplitudes are also damped accordingly. There are drawbacks. Moreover, even if the additional cost of this shock absorbing device is not considered, it is necessary to install this shock absorbing device, and special installation work must be carried out.

Furthermore, in an engine support device for elastically supporting an engine in a passenger car, two parts of the support body are
It is known that in addition to the shear spring, a damping device is arranged between the two fixed parts, with which low-frequency vibrations with large amplitudes are strongly damped. Although the engine support device configured in this way can basically be used in trucks, buses, or similar utility vehicles,
The very high weight of the engine necessitates heavy support devices of a size that can no longer be accommodated and, in particular, can no longer be fitted structurally.

According to German Patent Application No. 2935879 (Japanese Unexamined Patent Publication No. 55-36200), an engine support device for elastically supporting the engine of a passenger car is known. In addition to the elastomer spring, which is divided into at least two springs, an additional damping device is arranged between the two fixed parts in the support device. Since each spring of the elastomeric spring is assigned a special inertial mass, this engine support arrangement provides relatively little vibration damping in a given frequency range, as is the case, for example, in stationary engines. do not have. This known engine support device is not suitable for resiliently supporting the engine in trucks, buses or similar utility vehicles. This is because the supporting forces that occur in such utility vehicles are so large that the supporting device becomes so large that it can no longer be fitted structurally.

SUMMARY OF THE INVENTION The object of the present invention is to provide an engine support for elastically and hydraulically damping an engine, which has hitherto only been used in passenger cars or similar vehicles, for trucks, buses or similar utility vehicles. It should also be configured so that it can also be attached.

The present invention solves this problem, and the elastomer spring has an outer shear spring divided into one or more parts, and a ring-shaped inner rubber spring supported via a base at a lower part fixed to the vehicle frame. The rubber spring cooperates with the base body and a dish-shaped bellows tightened on the upper part fixed to the engine to form a chamber,
This chamber is oriented toward the base body and filled with a buffer liquid by means of an elastic partition wall fastened to the upper part, which is fixed to the engine, and provided with a throttle opening. It is divided into a compensation chamber which receives a portion of the liquid without being loaded.

Further, the shear spring, which is firmly connected to the upper part that is fixed to the engine, comes into contact under load with the sloped surfaces of the lower part and the side parts, which are the parts that are fixed to the vehicle.

With this arrangement, only a small portion of the bearing load is accepted by the inner ring-shaped rubber spring, resulting in effective damping of low-frequency vibrations. Due to the low bearing loads, it is possible to construct the spring-damping device very small, similar to that in passenger cars, and to place it in the engine bearing without changing the structural dimensions of the engine bearing. be.

According to an advantageous embodiment of the invention, the partition wall comprises:
It is designed like a diaphragm and has at least one subregion with a slight stiffness that also increases as the deformation increases.
This configuration provides the necessary spring properties for the partition wall, which provides good damping properties in the low-frequency vibration range with large amplitudes, but also in the low-frequency vibration range that causes vibration noise. A slight stiffness was obtained in the high frequency vibration range with .

At least one of the upper parts fixed to the engine is provided with a resilient layer on a surface adjacent to the lower part fixed to the vehicle frame. This elastic layer forms a flexible stop particularly in the case of low-frequency vibrations with large amplitudes, so that the formation of noise is avoided.

In order to reduce manufacturing costs, especially vulcanization costs,
According to another embodiment of the invention, the shear spring, which is rigidly connected to the upper part that is fixed to the engine, rests under load on the sloped surface of the lower part and the leg, which are the parts that are fixed to the vehicle. . In this case, the metal sheet attached to the shear spring and used as a reinforcing material facilitates the fitting operation of the shear spring. According to another embodiment of the invention, during unloading of the engine bearing, the lower part and the collar, which are fixed to the vehicle, protrude into the recess in the upper part, which is fixed to the engine, in order to receive part of the load. It is equipped with an elastic stopper. The elasticity of the stopper is obtained by a rubber layer provided in the stopper or notch.

Next, the configuration of the present invention will be specifically explained with reference to the embodiments shown in the drawings.

The engine support 1 of the engine of a truck, shown in FIG. 1, consists of a U-shaped lower part 2, which is attached in a known manner to a frame part 3 (FIG. 2), only shown in outline. It is fixed,
Its two legs 4 are directed outwards. The wedge-shaped upper part 7 is connected to the lower part 2 by means of two block-shaped shear springs 6 with metal plates on the mounting surface.
It is supported by two legs 4. The lateral connecting surfaces of the upper part 7, which receive the vulcanized shear springs 6, have a similar slope to the legs 4. The upper part 7 is the second
As shown, it supports a flange 8 of an engine, not shown in detail, and has a free internal chamber 9.

A collar 10, which is manufactured integrally with the lower part 2, projects in the lower region of this internal chamber 9;
The free end of 0 receives a basic body 11 made of a bowl-shaped sheet metal and guides this basic body 11 into a spring and damping device 12, which will be described in more detail below. In this guiding and receiving area, the basic body 11 is provided with a thin rubber layer 13 as an elastic layer, which rubber layer 1
3 is simultaneously vulcanized into a ring-shaped rubber spring 14.

Via this rubber spring 14, the basic body 11 and thereby also the lower part 2 are connected to the upper part 7, with the rubber spring 14 also being connected to the upper part 7 by vulcanization.

In the upper part 7, a rubber layer 15 as a thin stepped elastic layer extends from the rubber spring 14 on the one hand in the region of the collar 10 and further on to the shear spring 6. The rubber layer 15 covers this collar 1 within the collar 10.
It forms an elastic stop for 0. On the other hand, a thin rubber layer 16, also an elastic layer, extends from the rubber spring 14 to a circular recess 17 in the upper part 7, into which a lid 18 for closing the upper part 7 is inserted. held in place by screws. A thin metal ring 19 of a diaphragm 20 serving as a partition wall is stretched over the notch 17, and in this embodiment, this thin metal ring 19 is stretched over the U-shaped edge 21 of a dish-shaped bellows 22. surrounded by. The lid 18 now protects the bellows 22 from damage.

The diaphragm 20 has a rubber section 23 vulcanized to the sheet metal ring 19, which rubber section 23 is provided with a central opening 24, which in this embodiment acts as a diaphragm, and which has a small opening in the vicinity of the sheet metal ring. Ring-shaped clamping parts 25 are provided on both sides as rigid partial areas. Base 1
1. Rubber spring 14, rubber layer 16 and diaphragm 2
The chamber 26, which is delimited by 0 and filled with a buffer liquid, has an opening 2 with a throttling effect.
4 forms a fluid connection with a compensation chamber 27, which is surrounded by the diaphragm 20 and the bellows 22. Due to the shape of the bellows 22, this compensating chamber 27 receives a portion of the buffer liquid of the chamber 26 almost unloaded.

Due to the reduced cross-section of the rubber part 23 or the diaphragm 20 formed by the clamping part 25, this reduced cross-section deforms relatively strongly during high-frequency vibrations with small amplitudes, so that these vibrations are It is not attenuated very much or it is only slightly attenuated. In the event of vibrations with low frequency and large amplitude, the rubber part 23, the diaphragm 20 deforms little further, so that in this case the buffer liquid flows from the chamber 26 via the opening 24 into the compensation chamber 27. As a result, this vibration is damped relatively strongly. The lid 18 of the upper part 7 is provided with ventilation and exhaust openings, which are not shown. This means that when the compensation chamber is expanded, the lid 18
Ensure that no pressure builds up below the

As already mentioned, the shear spring 6 is permanently connected to the leg 4 of the lower part 2, so that it is pushed into the lower part 2 under the preload of the upper part 7 and the spring-damping device 12. It will be done. In this case, the metal sheet 5 as a reinforcing material alleviates this pushing process. In order to absorb part of this load when the engine support is relieved, an adjustable stop pin 28 as an elastic stop is fixed to the collar 10 of the lower part 2, which stops in the cutout of the upper part 7. Collaborate with Kashi 29. The so-called stop area of this notch 29 is covered by a rubber layer 30 as an elastic stop.

In a variant of the illustrated embodiment, the spring and damping device 12 is arranged in the engine bearing arrangement 1 oppositely to this illustrated embodiment, or
It is also possible to rotate the entire unit 180°. The diaphragms 20 may each have any arbitrary shape or configuration, provided that these arbitrary shapes or configurations have the necessary spring properties.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram, partially in section, of an engine support according to the invention, and FIG. 2 is a side view, partially in section, of the engine support according to FIG. DESCRIPTION OF SYMBOLS 1... Engine support device, 2... Lower part, 3... Frame part, 4... Leg part, 5... Metal thin plate, 6... Shear spring, 7... Upper part, 8... Flange, 9... Internal chamber, 10
...Brim, 11...Base, 12...Spring and damping device, 1
3... Rubber layer, 14... Rubber spring, 15, 16... Rubber layer, 17... Notch, 18... Lid, 19... Metal thin plate ring, 20... Diaphragm, 21... Edge, 22...
Bellows, 23...Rubber part, 24...Opening, 25...
Tightening portion, 26...chamber, 27...compensation chamber, 28...stopper pin, 29...notch, 30...rubber layer.

Claims (1)

[Scope of Claims] 1. An engine support device for a truck, bus or similar utility vehicle, comprising a lower part and an upper part which are fixable to the vehicle frame and the engine, respectively, and which are connected to each other via an elastomer spring. , a hydraulic damping device, in which the elastomeric spring has an outer shear spring 6 in one or more parts and a basic body 11 in the lower part 2 which is fixed to the vehicle frame. and a ring-shaped inner rubber spring 14 that is supported via a ring-shaped inner rubber spring 14 that cooperates with the base body 11 and a dish-shaped bellows 22 that is tightened on the upper part 7 that is fixed to the engine. The base body 1 is connected to the base body 1 by an elastic partition wall 20 which is fastened to the upper part 7 fixed to the engine and is provided with a throttle opening 24.
1 and filled with a buffer liquid, and a compensating chamber 27 which receives a portion of this buffer liquid without being under load and is rigidly attached to the upper part 7 which is fixed to the engine. A truck, a bus, or similar utility vehicle, characterized in that the coupled shear spring 6 is in abutment under load against the inclined surfaces of the lower part 2 and the leg part 4, which are parts fixed to the vehicle. Engine bearing equipment for cars. 2. The partition wall 20 is constructed in the form of a diaphragm and has at least one partial region 25 with a slight stiffness that increases as the deformation increases.
The engine support device described in Section 1. 3. At least one of the upper parts 7 fixed to the engine is provided with an elastic layer 13, 15, 16 on the side adjacent to the lower part 2 fixed to the vehicle frame. engine bearing system. 4. The engine support according to claim 4, wherein the lower part 2 and the collar 10 that are fixed to the vehicle are provided with elastic stoppers 28 and 30 that protrude into the notch 29 of the upper part 7 that is fixed to the engine. Device. 5. Engine support device according to claim 4, characterized in that the side of the shear spring 6 facing towards the lower part 2 fixed to the vehicle is provided with a reinforcing member 5.